How you stop your phone from creating two albums with same photos after syncing

When I first bought my phone I was able to sync my photos by checking the folder I wanted synced under iTunes. This put all those photos on photo library on my phone. I recently added more photos to that folder and tried to sync them it now put them in the photo library album and also created another album with my folder name. So I have two albums with the same photos. I tried in checking that folder in iTunes and of course they're not in my photo library. Please help. I don't want two albums with the same pics